Output signal indicator on the KA2281 chip. Scheme, description

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Output signal indicator on the KA2281 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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The device is based on an integrated circuit from Samsung KA2281 (two-channel five-digit display amplifier with a logarithmic scale). This inclusion of the microcircuit differs from the standard one only in the introduction of additional LEDs D11 and D12, which light up immediately when the device is turned on and indicate readiness for operation.

Output signal indicator on the KA2281 chip

The sensitivity of the indicator is adjusted by resistors R3 and R4 for each stereo channel separately, and the speed of LED extinguishing is adjusted by capacitors C1 and C2.

The LEDs start lighting from right to left (see diagram) for both stereo channels. To indicate the signal peak, place LEDs D1 and D6 with a red glow (in the diagram, all AL307V LEDs are green). The indicator is connected to the linear output of a tape recorder or some other similar device.

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